[OpenMP]Add support for workshare loop modifier in lowering

When lowering the dynamic, guided, auto and runtime types of scheduling,
there is an optional monotonic or non-monotonic modifier. This patch
adds support in the OMP IR Builder to pass this down to the runtime
functions.

Also implements tests for the variants.

Differential Revision: https://reviews.llvm.org/D102008

Author: Leporacanthicus

llvm/include/llvm/Frontend/OpenMP/OMPConstants.h

@@ -117,10 +117,12 @@ enum class OMPScheduleType {
   Runtime = 37,
   Auto = 38, // auto
 
+  ModifierMonotonic =
+      (1 << 29), // Set if the monotonic schedule modifier was present
   ModifierNonmonotonic =
-      (1 << 30), /**< Set if the nonmonotonic schedule modifier was present */
-
-  LLVM_MARK_AS_BITMASK_ENUM(/* LargestValue */ ModifierNonmonotonic)
+      (1 << 30), // Set if the nonmonotonic schedule modifier was present
+  ModifierMask = ModifierMonotonic | ModifierNonmonotonic,
+  LLVM_MARK_AS_BITMASK_ENUM(/* LargestValue */ ModifierMask)
 };
 
 } // end namespace omp

llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp

@@ -1431,10 +1431,8 @@ OpenMPIRBuilder::InsertPointTy OpenMPIRBuilder::createDynamicWorkshareLoop(
 
   Value *ThreadNum = getOrCreateThreadID(SrcLoc);
 
-  OMPScheduleType DynamicSchedType =
-      SchedType | OMPScheduleType::ModifierNonmonotonic;
   Constant *SchedulingType =
-      ConstantInt::get(I32Type, static_cast<int>(DynamicSchedType));
+      ConstantInt::get(I32Type, static_cast<int>(SchedType));
 
   // Call the "init" function.
   Builder.CreateCall(DynamicInit,

llvm/unittests/Frontend/OpenMPIRBuilderTest.cpp

@@ -1721,7 +1721,7 @@ TEST_P(OpenMPIRBuilderTestWithParams, DynamicWorkShareLoop) {
 
   omp::OMPScheduleType SchedType = GetParam();
   uint32_t ChunkSize = 1;
-  switch (SchedType) {
+  switch (SchedType & ~omp::OMPScheduleType::ModifierMask) {
   case omp::OMPScheduleType::DynamicChunked:
   case omp::OMPScheduleType::GuidedChunked:
     ChunkSize = 7;
@@ -1794,8 +1794,9 @@ TEST_P(OpenMPIRBuilderTestWithParams, DynamicWorkShareLoop) {
   EXPECT_EQ(InitCall->getCalledFunction()->getName(),
             "__kmpc_dispatch_init_4u");
   EXPECT_EQ(InitCall->getNumArgOperands(), 7U);
-  EXPECT_EQ(InitCall->getArgOperand(6),
-            ConstantInt::get(Type::getInt32Ty(Ctx), ChunkSize));
+  EXPECT_EQ(InitCall->getArgOperand(6), ConstantInt::get(LCTy, ChunkSize));
+  ConstantInt *SchedVal = cast<ConstantInt>(InitCall->getArgOperand(2));
+  EXPECT_EQ(SchedVal->getValue(), static_cast<uint64_t>(SchedType));
 
   ConstantInt *OrigLowerBound =
       dyn_cast<ConstantInt>(LowerBoundStore->getValueOperand());
@@ -1827,12 +1828,23 @@ TEST_P(OpenMPIRBuilderTestWithParams, DynamicWorkShareLoop) {
   EXPECT_FALSE(verifyModule(*M, &errs()));
 }
 
-INSTANTIATE_TEST_SUITE_P(OpenMPWSLoopSchedulingTypes,
-                        OpenMPIRBuilderTestWithParams,
-                        ::testing::Values(omp::OMPScheduleType::DynamicChunked,
-                                          omp::OMPScheduleType::GuidedChunked,
-                                          omp::OMPScheduleType::Auto,
-                                          omp::OMPScheduleType::Runtime));
+INSTANTIATE_TEST_CASE_P(
+    OpenMPWSLoopSchedulingTypes, OpenMPIRBuilderTestWithParams,
+    ::testing::Values(omp::OMPScheduleType::DynamicChunked,
+                      omp::OMPScheduleType::GuidedChunked,
+                      omp::OMPScheduleType::Auto, omp::OMPScheduleType::Runtime,
+                      omp::OMPScheduleType::DynamicChunked |
+                          omp::OMPScheduleType::ModifierMonotonic,
+                      omp::OMPScheduleType::DynamicChunked |
+                          omp::OMPScheduleType::ModifierNonmonotonic,
+                      omp::OMPScheduleType::GuidedChunked |
+                          omp::OMPScheduleType::ModifierMonotonic,
+                      omp::OMPScheduleType::GuidedChunked |
+                          omp::OMPScheduleType::ModifierNonmonotonic,
+                      omp::OMPScheduleType::Auto |
+                          omp::OMPScheduleType::ModifierMonotonic,
+                      omp::OMPScheduleType::Runtime |
+                          omp::OMPScheduleType::ModifierMonotonic));
 
 TEST_F(OpenMPIRBuilderTest, MasterDirective) {
   using InsertPointTy = OpenMPIRBuilder::InsertPointTy;